Hello again, I was initially planning on going the route of power filters for my tank but after looking at different tanks for inspiration, I decided I want to keep my tank looking as natural as possible (no HOB's) so I'm now considering canisters instead. First, what canisters would you recommend for a 72G bow front that will be used to house African Cichlids? I'm also curious as to how obvious the attachment parts that sit in the aquarium are as I want something that is as low profile as possible. And finally, do all canisters come with spray bars? If so, how much surface disruption does this offer? Will it be enough to oxygenate my tank or do I need to find another method? I think I've even heard of canisters offering the option of adding oxygen to the water but I may be mistaken... Then there's always the issue of activated carbon. How does that work into canister filters??? Any and all info you can pass along to my eager eyes and ears would be greatly appreciated!!